Unit size: 454*154*30.5mm. Ps/2 or USB port. 104keys, waterproof design. Laser inscribed letters. Compatible : windows 7/95/97/98/nt/me/2000/2003/xp/vista Erials against the wear, durability, resistance to attack. Net weight : 574.8g. Key life : 5, 000.000 times. Zantek international limited is a private high-tech enterprise, which is specialized in computer peripheral product industry, located in shenzhen of china. It was founded with the mission of providing our customers with quality products, professional service, and informative product information. 20pcs/carton, gw:14kg.